Screw-propeller.



No. 769,621. PATENTED SEPT. 6, 1904.

0. A. MANKBR. SCREW PROPELLER.

APPLICATION FILED SEPT. B, 1903- NO MODEL.

.INVENTOR CAREY A. MANKER.

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ATTEST. I

UNITED STATES Patented September 6, 1904;.

PATENT OEEIcE.

NER NAVIGATION COMPANY, OF

TION OF ARIZONA TERRITORY.

ST. LOUIS, MISSOURI, A CORPORA- SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 769,621, datedSeptember 6, 1904.

Application filed September 8, 1903. Serial No. 172,375, (No modelJ T(1. IUILO'I'IZ/ it may norm/17w.-

Be it known that I, CAREY A. B'IANKER, a citizen of the United States,residing in Pearl, in the county of Pike and State of Illinois, haveinvented certain new and useful Improvements in Screw-Propellers, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming part of thisspecification.

My invention relates to that class of screwpropellers in which thepropeller-blades are moved into a pitch on their descending strokesvarying from the pitch on their ascending strokes, and vice versa,whereby a lifting action or thrust is obtained in the plane of thepropellers revolution in addition to the hori- Zontal propelling thrust,so that while the vessel is being propelled it will more or less belifted toward the surface of the water to partially eliminate theresistance of the water to the movement of the hull of the boat therein.

The invention consists in features of novelty hereinafter fullydescribed, and pointed out in the claims.

Figure I is a vertical section taken through the propeller on irregularline I I, Fig. II. Fig. II is a longitudinal section taken on line IIII, Fig. I, through the center of the propeller. Fig. III is a verticalcross-section taken on line III III, Fig. II. Fig. IV is. an elevationof the propeller. Fig. V is a similar view to Fig. III, showingmodification or variation in the shape of the cam-groove in theshiftable hub member of the propeller. FigzVI is a longitudinal sectiontaken through a modification of the propeller-hub.

1 designates a propeller-shaft, that is journaled in a bearing 3,provided with an extension-arm a. (See Fig. II.)

2 is a collar fixed to the propeller-shaft and located adjacent to thebearing 3 to limit the end thrust of the propeller-shaft.

5 designates a hub member mounted on the propeller-shaft and rigidlysecured thereto by any suitable means, such as the set-screws 6. (Seenin Fig. II.)

7 is a ring carried by the rear end of the hub member 5, to which it isattached by suitable means, such as the connecting-screws S.

9 designates propellerblades that are of helical shape, as seen in Figs.I and IV. Each blade has astem 10, that is rockingly fitted in channelsprovided for its reception in the rear side of the hub member 5 and theopposing ring 7, the channels extending in lines transversely to theaxes of said member and ring. Projecting-from each blade-stem is arocking stem 11. (See Figs. 1, II, and III.) These stems serve to impartoscillation to the blades to vary their pitch in the manner hereinafterstated.

12 designates a shiftable hub member having a central aperture 13 ofgreater vertical area than the diameter of the propeller-shaft which itencircles. This shiftable hub member opposes the fixed propeller-shaftcarried by hub member 5 and the ring I fitted thereto, and it isarranged to be shifted vertically through the medium of a shift-screwII, that is rotatably mounted in the bearing-extension arm I and is heldfrom endwise movement by a collar 15 thereon (see Fig. II) that is lo'cated in said extension-arm. The lower end of the shift-screw hasthreaded engagement with the shiftablc member 12, so that when the screwis turned the shiftable hub member is raised or lowered. In the forwardend of the shiftable hub member is a cam-groove 16, that occupies aposition eccentric to the axes of the propeller-blade stems It), thedegree of eccentricity being dependent upon the degree of elevation ofthe shiftable hub member.

17 represents runner-blocks that are positioned in the caurgroove 16 toride therein during the rotation of the propeller-shaft, its blades andtheir stems to cause travel with the blade-stems of their studs 11. Therunnerblocks are recessed to receive the studs 11, which fit thcreinto,as seen in Figs. II and III. 18 is an oil-hole leading through the hubmember 12 to the cam-groove 16, this oil-hole being protected by a cover19.

In the practical operation of my propeller as the propeller-shaftrevolves it carries thererocking motion is imparted to the blade-stemtravel of the boat is secured.

studs and the blade-stems that occasions constant change of pitch orangle of the propeller- This blades during their course of travel.change of pitch or angle is considered with respect to the axis of thepropeller-shaft, and the degree of change is governed by the degree ofeccentricity of the cam-groove to the axes of the propeller-blade stems.The result of this construction is that as the propeller-blades move inthe direction indicated by the arrows, Fig. I, their working faces arecaused to face downwardly and rearwardly during the descending strokeofthe blades, and during their ascending strokes the blades are turnedrearwardly and upwardly to offer the least resistance to their passagethrough the water. As a consequence the blades act with the greatestefiiciency to propel the boat forwardly when they are descending andalso exert a lifting influence to raise the boat to which the propelleris applied, thereby elevating the boat and diminishing the waterdisplacement, so that less resistance to the The blades being deflectedinto the positions stated during their upward strokes move with lessresistance through the water than during their descending strokes, andtherefore the blades descending may act with greater force than theycould if their pitch were altered previous to the ascending movement.When it is desired to operate the propeller in securing slower speed orto back the vessel, the shiftable hub member 12 may be moved intoposition that will .render its axis corresponding to the axis of thepropeller-shaft, and when this is done the propeller-blade will occupyuniform pitch, and the propeller may be operated with the same utilityas screw-propellers of common type,

In Fig. V, I have shown a modification in which the shiftable hub member12 is provided with a vertical elongated cam-groove 16, as distinguishedfrom the cam-groove illus trated in Figs. II and III.

In Fig. VI, I have shown a modification in which a fixed propeller-stem1 is utilized as a support for the propeller in lieu of its beingrotatably carried by the propeller-shaft. In this stem is a cam-groove16, that receives the runner-blocks 17, into which the studs 11 of theblade-stems 1O are fitted. The hub members 5 and 12 are rotatablymounted on the stem l and connected for united rotation. These membersare designed to be rotated on the supporting-stem l by power appliedthereto in any suitable manner, and as the members are rotated thepropeller-blades are varied in pitch in a similar manner to thatdescribed in connection with the construction shown in Figs. I to IV.

I claim as my invention- 1. In a screw-propeller, the combination of ashaft, a member carried by said shaft, helical blades rockingly mountedin said member, and means whereby the pitch of said blades is variedwith respect to the axis of said shaft at different positions in thepath of their movement; said means consisting of a shiftable memberprovided with a cam-groove adapted to receive parts carried by saidblades.

2. In a screw-propeller, the combination of a shaft, a member carried bysaid shaft, helical blades rockingly mounted in said member,

and means whereby the pitch of said blades is varied with respect to theaxis of said shaft at different positions in the path of their movement;said means consisting of a shiftable member provided with a cam-grooveadapted to receive parts carried by said blades, and means for shiftingsaid shiftable member.

3. In a screw-propeller, the combination of a shaft, a member carried bysaid shaft, helical blades rockingly mounted in said member, and meanswhereby the pitch of said blades is varied with respect to the axis ofsaid shaft at different positions in the path of their movement; saidmeans consisting of a shiftable member provided with a cam-grooveadapted to receive parts carried by said blades, and a set-screwengaging and shifting said shiftable member, substantially as set forth.

4. In a screw-propeller, the combination of a shaft, a hub membercarried by said shaft, a plurality of helical blades having stems fittedto said hub, studs carried by said bladestems, and a shiftable hubmember located in proximity to said shaft-carried hub member andprovided with a cam-groove in the course of which said blade-stem studstravel, substantially as set forth.

5. In a screw-propeller, the combination of a shaft, a hub membercarried by said shaft, a plurality of'helical blades having stems fittedto said hub, studs carried by said bladestems, a shiftable hub memberlocated in proximity to said shaft-carried hub member and provided witha cam-groove in the course of which said blade-stem studs travel, andrunner-blocks operating in said cam-groove and receiving said blade-stemstuds.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CAREY A. MANKER.

VVi-tnesses:

ARTHUR MANKER, GENEVIEVE MANKER.

